<!--
 * @Author: 胡海
 * @Date: 2020-08-29 13:09:52
 * @LastEditors: 胡海
 * @LastEditTime: 2020-09-02 20:42:03
 * @Description: 
-->
<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass"
     class="star-item" track-by="$index"></span>
  </div>
</template>

<script  type="text/ecmascript-6">
  const LENGTH = 5;
  const CLS_ON = 'on';
  const CLS_HALF = 'half';
  const CLS_OFF = 'off';
export default {
  props: {
    size: {
      type: Number
    },
    score:{
      type: Number
    }
  },
  computed:{
    starType(){
      return 'star-' + this.size;
    },
    itemClasses() {
      let result = [];
      let score = Math.floor(this.score * 2) / 2;
      let hasDecimal = score % 1 !== 0;
      let integer = Math.floor(score);
      for (let i = 0; i < integer; i++) {
        result.push(CLS_ON);
      }
      if (hasDecimal) {
        result.push(CLS_HALF);
      }
      while (result.length < LENGTH) {
        result.push(CLS_OFF);
      }
      return result;
    }
  }
};
</script>

<style lang="stylus" rel="stylesheet/stylus">
  @import "../../common/stylus/mixin.styl"
  
  .star
    font-size: 0
    .star-item
      display: inline-block
      background-repeat: no-repeat   
    &.star-48
      .star-item
        width: 20px 
        height: 20px 
        margin-right: 22px 
        background-size: 20px 20px  
        &:last-child 
          margin-right: 0
        &.on
          bg-image('star48_on')
        &.half
          bg-image('star48_half')
        &.off
          bg-image('star48_off')  
    &.star-36
      .star-item
        width: 15px 
        height: 15px 
        margin-right: 16px 
        background-size: 15px 15px  
        &:last-child
          margin-right: 0
        &.on
          bg-image('star36_on')
        &.half
          bg-image('star36_half')
        &.off
          bg-image('star36_off')  
    &.star-24    
      .star-item
        width: 10px 
        height: 10px 
        margin-right: 3px 
        background-size: 10px 10px  
        &:last-child
          margin-right: 0
        &.on
          bg-image('star24_on')
        &.half
          bg-image('star24_half')
        &.off
          bg-image('star24_off')  
   
</style>